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89 F350 unknown wires

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Old 02-14-2014, 10:37 PM
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89 F350 unknown wires

Just picked up a '89 F350 Custom with the 7.3l IDI… This is my first diesel truck. This truck had been sitting for a while and pretty much started right up to drive it on to the trailer. We changed the fuel, oil and air filters so far.

I really like this site and find it very interesting.

As I explore the truck and get it road worthy, I came across some connectors without a home. Hoping someone here can identify the connectors and steer me in the right direction.

The first is a blue wire that is near the fuel filter…


This wire/connector is near center of the engine block, behind the oil fill…


Any help is appreciated
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Old 02-14-2014, 10:51 PM
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That first wire most likely goes to the water sensor that should be on the bottom of your fuel filter/water separator. Some one may have changed the filter to a style that doesn't use the sensor. The correct one will have a large cap that screws onto the bottom of the filter with the sensor and a drain ****. Nothing wrong with the other way, just eliminates the possibility of a leak from that cap.

I think the second plug goes to an A/C compressor...but not 100% sure.
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Old 02-14-2014, 11:07 PM
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Originally Posted by Sycostang67 View Post
That first wire most likely goes to the water sensor that should be on the bottom of your fuel filter/water separator. Some one may have changed the filter to a style that doesn't use the sensor. The correct one will have a large cap that screws onto the bottom of the filter with the sensor and a drain ****. Nothing wrong with the other way, just eliminates the possibility of a leak from that cap.
I agree. That was my first thought.



[/quote]I think the second plug goes to an A/C compressor...but not 100% sure.[/quote]

Not real sure mines a 93 and the connector looks a little different but I think you go this one right too.
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Old 02-14-2014, 11:18 PM
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In the same wire loom as the blue wire I'm trying to Identify, is the wire that goes to the bottom of the fuel filter… I think that one connects to the "water in fuel" sensor. That sensor seems to work because it was lit, and after we changed the filter it went out. And I don't have A/C
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Old 02-15-2014, 07:52 AM
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does your cold high idle work?
the temp sensor for the high idle timing advance in under the alternator.
i don't remember if it is a one wire or 2 wire connector though.
it may also be a glow plug connector for the passenger front cylinder.
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Old 02-15-2014, 12:28 PM
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does your cold high idle work?
the temp sensor for the high idle timing advance in under the alternator.
i don't remember if it is a one wire or 2 wire connector though.
it may also be a glow plug connector for the passenger front cylinder.

The cold idle seems fine... Fires up, and then kicks down after a bit, so that seems right to me.

I will look around the alternator and the glow plugs a little more later today. Work, before play... Sucks.
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Old 02-15-2014, 12:47 PM
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if the cold high idle works, than it is not the temp sensor wire.
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Old 02-15-2014, 09:44 PM
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Okay… This is what I've got. My mystery connector is on a blue wire that is in the same wire loom as the black wire going to the top of the fuel filter housing. The glow plug located under the fuel filter has a connector going to it.

It's a mystery, that's for sure
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